<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
       *{margin: 0px;padding: 0}
       /* float的原理：相对于整个页面漂浮起来  */
       .one{
           width: 100px;
           height: 100px;
           background: salmon;
           float: left;
       }
       /* 如何清除float
          clear:both; */
       .two{
           clear: both;  
           width: 200px;
           height: 200px;
           background: skyblue;
       }
    
    </style>
</head>
<body>
    <div class="one"></div>
    <div class="two"></div>
</body>
</html>